Description

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　　I. Main Functions

This device is a dedicated dot matrix event printer for ship engine room monitoring and alarm systems, used in conjunction with the engine room monitoring system:

Real-time Event Printing: Automatically triggers printing when any measuring point in the engine room triggers an alarm, the alarm is silenced, or the alarm is reset and returns to normal.

Complete Information Recording: Printed content includes: system timestamp, alarm channel name, alarm status (ON alarm / OFF reset).

Continuous Paper Log Retention: Dot matrix printing ensures long-lasting, fade-resistant ink, unlike thermal printers, meeting the requirements of maritime inspection agencies for recording navigation faults.

Online/Offline Self-Test: Power-on self-test reports printer fault status to the host computer; the monitoring host can generate printer fault alarms when the printer experiences disconnection, paper shortage, or other malfunctions.

Protocol Data Reception and Parsing: Receives dedicated protocol messages from the alarm host via a parallel interface, converts them into printable characters, and drives the print head to output.

Continuous Paper Feed and Multi-Line Printing: Prints continuously when multiple alarms occur consecutively, with automatic line wrapping, requiring no manual intervention.

　　II. Working Principle

Data Link Layer: The alarm control unit continuously outputs alarm event messages via a 36-pin Centronics parallel interface according to a dedicated communication protocol.

Printer Mainboard Parsing Unit: The printer control board receives serial/parallel data, performs level conversion in the hardware circuit, and the MCU parses the dedicated protocol data packets, separating the time, alarm name, and status information.

After the MCU recognizes a valid alarm event message, it outputs a drive signal:

It starts the paper feed motor to feed the printing paper.

It drives the printhead electromagnet to strike the ribbon, forming dot matrix text on the paper.

Status Feedback: The printer continuously detects paper shortages, open cover, communication interruptions, and hardware failures, and feeds fault signals back to the engine room alarm host.

Mechanical Actuation Mechanism: The dot matrix printhead + ribbon mechanism + paper feed gear set complete the text output; it is an impact-type dot matrix printer that relies on the ribbon to transfer text.

Simplified Signal Flow: Engine Room Alarm Host → Parallel Communication Cable → Printer Main Control Board MCU (Protocol Parser) → Printhead/Paper Feed Motor → Paper Alarm Record

　　III. Role in Ship Systems

1. Navigation Fault Tracing Carrier

When faults occur in the engine room, such as high main engine temperature, low oil pressure, or abnormal fluid levels, the original paper record is automatically saved. Afterwards, the engine room maintenance team, shipowner, and engine company analyze the sequence of events to determine the cause of the incident.

2. Maritime Inspection Legal Certificate

During maritime inspections and PSC port state control inspections, continuous alarm printouts can be presented to prove the handling process of equipment malfunctions; thermal paper fades over long-term storage, so dot matrix printouts are given priority by ship inspection agencies.

3. Centralized Control Duty Auxiliary Tool

Duty engineers no longer need to constantly monitor the screen; alarms are automatically printed, quickly identifying the fault location and preventing missed audible and visual alarms.

4. Component of System Integrity

The entire monitoring and alarm system is designed to include an event recorder. Printer malfunctions themselves generate system alarms, prompting engineers to promptly repair or replace ribbons and paper.

5. Data Backup Redundancy

Records in the monitoring host’s internal memory may be lost due to power outages or restarts; paper printouts create independent redundant logs.

　　Supplementary Maintenance Principles

Communication Method: Parallel IEEE1284, does not support direct USB connection to general computers, only compatible with the original manufacturer’s host protocol;

No independent operation keyboard, completely passively receives host commands, cannot manually input print content;

Power Supply: DC24V, shuts down upon power failure, automatically reconnects after power restoration and waits for alarm signals.

Important Instructions for On-Site Use (Ship Engine Room Control Console)

The equipment must not operate continuously below 0℃, as low temperatures will cause poor lubrication of the paper feed gears, printhead jamming, and ribbon breakage;

Long-term ambient temperature >50℃: Circuit board overheating, printhead overheating, and a significant increase in failure rate;

When ventilation inside the engine room cabinet is poor, the cabinet temperature is often higher than the ambient temperature; allow sufficient ventilation space during layout;

Condensation is strictly prohibited, as moisture will corrode the parallel port socket and main control circuit board, causing communication failures and garbled characters.

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